Control+C is used to kill a process with the signal SIGINT, and can be intercepted by a program so it can clean its self up before exiting, or not exit at all.

Control+C is used to kill a process with the signal SIGINT, and can be intercepted by a program so it can clean its self up before exiting, or not exit at all. ... Ctrl+D means end of file. It has no effect if the program isn't reading input from the terminal. Ctrl+C means “interrupt”, i.e., stop what you're doing.